Surface-enhanced Raman scattering interaction of p-aminobenzoic acid on a silver-coated alumina substrate |
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| Affiliation: | 1. Jundi Shapur University of Technology, Dezful, Iran;2. Amirkabir University of Technology, Tehran, Iran;1. Key Laboratory of Petroleum-Gas equipment of Education ministry, College of Mechanical and Electrical Engineering, Southwest Petroleum University, Sichuan Chengdu 610500, China;2. Key laboratory of Optoelectronic Sensing and Information Processing, College of Optoelectronic Information, University of Electronic Science and Technology of China, Sichuan Chengdu 610054, China;1. Australian Centre for Research on Separation Science, School of Physical Sciences, University of Tasmania, Sandy Bay, Hobart, Tasmania, Australia;2. ARC Industrial Training Centre for Portable Analytical Separation Technologies (ASTech), School of Physical Sciences, University of Tasmania, Sandy Bay, Hobart, Tasmania, Australia;1. Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908, PR China;2. Institute of Materials, China Academy of Engineering Physics, Mianyang 621700, PR China;3. Chengdu Science and Technology Development Center, Chengdu, 610200, PR China |
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| Abstract: | The adsorption behavior of p-aminobenzoic acid (PABA) molecules on a silver-coated alumina surface-enhanced Raman scattering (SERS) substrate was investigated. For spotted PABA and PABA in non-polar solvents, the PABA molecule is adsorbed flat on the surface of the SERS substrate. In this orientation, the benzene ring is π-bonded to the substrate, and the molecule is further anchored to the substrate by the binding of the lone pairs of NH2 and COO− groups onto the metal surface. On the other hand, the adsorption behavior of PABA in a polar solvent is greatly influenced by the hydrogen bonding of the amine group with the polar solvent. In this orientation, the molecule is preferentially adsorbed through the COO± and assumes a non-flat orientation on the metal surface. |
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